On the Origin of SpeciesHarvard University Press, 2003 - Всего страниц: 553 It is now generally recognized that the publication of Darwin's Origin of Species in 1859 not only decisively altered the basic concepts of biological theory but had a profound and lasting influence on social, philosophic, and religious thought. This work is rightly regarded as one of the most important books ever printed. |
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... hybrids , there are many points of similarity . In both cases the sterility is independent of general health , and ... hybrids . On the other hand , one species in a group will some- times resist great changes of conditions with ...
... hybrids ; but Gärtner admits that hybrids from species which have long been cultivated are often variable in the first generation ; and I have myself seen striking instances of this fact . Gärtner further admits that hybrids be- tween ...
... hybrids . This greater variability of mongrels than of hybrids does not seem to me at all surprising . For the parents of mongrels are varieties , and mostly domestic varieties ( very few experiments having been tried on natural ...
Содержание
VARIATION UNDER DOMESTICATION | 7 |
VARIATION UNDER NATURE | 44 |
STRUGGLE FOR EXISTENCE | 60 |
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An Introduction to Behavioural Ecology Nicholas B. Davies,John R. Krebs Недоступно для просмотра - 1993 |